27 Intermolecular forces Upgrade class revision

27 Intermolecular forces Upgrade class revision

Multiple Choice

Identify the compound that has a higher boiling point in each of the three pairs of compounds shown below.

a) HCl and HBr

• HCl

• HBr

Multiple Select

Explain why boiling point of HBr > HCl

by choosing the appropriate key phrases below. (There could be more than 1 answer)

(2 marks)

• van der Waals' forces between HBr molecules > HCl molecules

• hydrogen bonding between HBr molecules is stronger than the van der Waals' forces between HCl molecules

• molecular size of HBr > HCl

• HBr is more polar than HCl

Multiple Choice

Identify the compound that has a higher boiling point in each of the three pairs of compounds shown below.

b) CCl₄ and CBr₄

• CCl₄

• CBr₄

Multiple Select

Explain why boiling point of CBr₄ > CCl₄

by choosing the appropriate key phrases below. (There could be more than 1 answer)

(2 marks)

• van der Waals' forces between CBr₄ molecules > CCl₄ molecules

• hydrogen bonding between CBr₄ molecules is stronger than the van der Waals' forces between CCl₄ molecules

• molecular size of CBr₄ molecules > CCl₄ molecules

• CBr₄ is more polar than CCl₄

Multiple Choice

Identify the compound that has a higher boiling point in each of the three pairs of compounds shown below.

c) CH₃CH₂CH₂CH₃ and CH₃COCH₃

• CH₃CH₂CH₂CH₃

• CH₃COCH₃

Multiple Select

Explain why boiling point of CH₃COCH₃ > CH₃CH₂CH₂CH₃

by choosing the appropriate key phrases below. (There could be more than 1 answer)

(2 marks)

• van der Waals' forces between CH₃COCH₃ molecules > CH₃CH₂CH₂CH₃ molecules

• hydrogen bonding between CH₃COCH₃ molecules is stronger than the van der Waals' forces between CH₃CH₂CH₂CH₃ molecules

• molecular size of CH₃COCH₃ > CH₃CH₂CH₂CH₃

• CH₃COCH₃ is polar while CH₃CH₂CH₂CH₃ is not

Multiple Choice

Compare the boiling points of NH₃ and PH_3.

Which one has a higher boiling point?

• NH₃

• PH₃

Multiple Select

Explain why boiling point of NH₃ > PH₃

by choosing the appropriate key phrases below. (There could be more than 1 answer)

(2 marks)

• van der Waals' forces between NH₃ molecules > PH₃ molecules

• hydrogen bonding between NH₃ molecules is stronger than the van der Waals' forces between PH₃ molecules

• molecular size of NH₃ > PH₃

• N-H bond is very polar while P-H bond is not

Multiple Choice

Compare the viscosity of propan-1-ol and propane-1,2,3-triol. Which one will have a higher viscosity?

• propan-1-ol

• propane-1,2,3-triol

Open Ended

Explain why propane-1,2,3-triol is more viscous propan-1-ol.

(1 mark)

Multiple Choice

Compare the volatility of propan-1-ol and propanone. Which one will have a higher volatility?

• propan-1-ol

• propanone

Open Ended

Explain why propanone has a higher volatility than propan-1-ol.

(1 mark)

Multiple Choice

Compare the solubility of ethanol and ethane in water. Which one is soluble in water?

• ethanol

• ethane

Open Ended

Explain why ethanol is soluble in water while ethane is not.

(1 mark)